package com.sunyard.manage.util;

import org.apache.commons.lang3.StringUtils;

import javax.xml.bind.*;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Collection;

/**
 * @author daox.nie
 * @Description xml工具类
 * @date 2017年2月9日 下午3:12:32
 */
public class JaxbUtil {
    /**
     * 多线程安全的Context.
     */
    private JAXBContext jaxbContext;
    /**
     * Description
     */
    public final static String CHARSET = "UTF-8";

    /**
     * Description
     */
    public static String beanToxml(Object bean) {
        try {
            JAXBContext context = JAXBContext.newInstance(bean.getClass());
            Marshaller marshaller = context.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.FALSE);
            marshaller.setProperty(Marshaller.JAXB_ENCODING, CHARSET);
            Writer writer = new StringWriter();
            marshaller.marshal(bean, writer);
            return writer.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * Description
     */
    @SuppressWarnings("unchecked")
    public static <T> T xmlToBean(String xml, Class<T> clazz) {
        T t = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            t = (T) unmarshaller.unmarshal(new StringReader(xml));
            return t;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return t;
    }


    /**
     * @param types 所有需要序列化的Root对象的类型.
     */
    public JaxbUtil(Class<?>... types) {
        try {
            jaxbContext = JAXBContext.newInstance(types);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Java Object->Xml.
     */
    public String toXml(Object root, String encoding) {
        try {
            StringWriter writer = new StringWriter();
            createMarshaller(encoding).marshal(root, writer);
            return writer.toString();
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }


    /**
     * Java Object->Xml, 特别支持对Root Element是Collection的情形.
     */
    @SuppressWarnings("unchecked")
    public String toXml(Collection root, String rootName, String encoding) {
        try {
            CollectionWrapper wrapper = new CollectionWrapper();
            wrapper.collection = root;

            JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(
                    new QName(rootName), CollectionWrapper.class, wrapper);

            StringWriter writer = new StringWriter();
            createMarshaller(encoding).marshal(wrapperElement, writer);

            return writer.toString();
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Xml->Java Object.
     */
    @SuppressWarnings("all")
    public <T> T fromXml(String xml) {
        try {
            StringReader reader = new StringReader(xml);
            return (T) createUnmarshaller().unmarshal(reader);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Xml->Java Object, 支持大小写敏感或不敏感.
     */
    @SuppressWarnings("unchecked")
    public <T> T fromXml(String xml, boolean caseSensitive) {
        try {
            String fromXml = xml;
            if (!caseSensitive) {
                fromXml = xml.toLowerCase();
            }
            StringReader reader = new StringReader(fromXml);
            return (T) createUnmarshaller().unmarshal(reader);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 创建Marshaller, 设定encoding(可为Null).
     */
    public Marshaller createMarshaller(String encoding) {
        try {
            Marshaller marshaller = jaxbContext.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");////编码格式
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.FALSE);//是否格式化生成的xml串
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.FALSE);//是否省略xm头声明信息

            if (StringUtils.isNotBlank(encoding)) {
                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
            }
            return marshaller;
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 创建UnMarshaller.
     */
    public Unmarshaller createUnmarshaller() {
        try {
            return jaxbContext.createUnmarshaller();
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 封装Root Element 是 Collection的情况.
     */
    public static class CollectionWrapper {
        @SuppressWarnings("unchecked")
        @XmlAnyElement
        protected Collection collection;
    }


}
